光学精密工程2013，Vol.21Issue(8)：2154-2160,7.DOI:10.3788/OPE.20132108.2154
离轴三反消像散多光谱相机调焦系统设计
Design of focusing system for multispectral camera with off-axis TMA
摘要
Abstract
The defocusing of imaging plane for a space camera in severe space environments will effect the imaging quality.It is necessary to compensate the defocusing effectively for the space camera tc improve the adaptabilities and to get a high quality image.A novel focusing system was designed for a multispectral camera with off-axis Three Mirror Anastigmat(TMA) system.Firstly,the focusing method was chosen,and the principle of focusing was described by analyzing the characteristics of the off-axis TMA system and the CCD focal plane.Then,the focusing system was introduced in detail,including the working condition of a focusing controller,the way to calculate the torque of a stepper motor,and the design parameters of focusing mechanism and the position sensor.Furthermore,the correlation between the focusing accuracy and focusing mechanism,sensor resolution was deduced.Finallv,the relative curve of CCD position with an encoder was obtained in the focusing range by the proposed focusing system.Experimental result shows that the focusing accuracy in closed-loop control is ±3.11 μm (3σ).It can satisfy the system requirements of ±10 μm.关键词
离轴三反相机/多光谱相机/消像散/CCD焦平面/调焦系统/调焦精度/闭环控制Key words
Three Mirror Anastigmat(TMA)/multispectral camera/CCD focus plane/focusing precision/closed-loop control分类
信息技术与安全科学引用本文复制引用
吕世良,刘金国,贾平,徐东..离轴三反消像散多光谱相机调焦系统设计[J].光学精密工程,2013,21(8):2154-2160,7.基金项目
国家青年科研基金资助项目(No.61008046) （No.61008046）
